Improvement in wagon-spring



r. MGGARTHY,

Carriage-Spring. A r

No. 67,782. Patehted'Aug. 13. 1867.

PEIERS. FHOTQ-LITHOGRAFH ER, WASHINGTON. n. Q.

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EDMUND P. McGARTHY, OF SAN FRANCISCO, GALIEORNIA.

Letters Patent No. 67,782, dated August 13, 1867.. i

IMPROVEMENT IN WAGON-SPRING.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, EDMUND P. McCARTHY, of San Francisco, county of SanFrancisco, State of California, have invented an improved Wagon-Spring;and I do-hereby declare the following description and accompanyingdrawings are sufiicient to enable any person skilled in the art orscience to which it most nearly appertains to make and use my saidinvention or improvement without further invention or experiment.

The nature of my invention is to provide a wagon-spring, so constructedthat the leaves will not be easily broken, however great the weight orthe spring or tension upon them may be. In order to accomplish thisobject I attach to the inner face of the upper and lower portion of thespring metal cups. Midway. between these cups is fixed a rubber ball,by'means of a spindle passing through it, and when the spring is broughttogether sufiiciently the ball is held between the cups and receives theweight of the load.

To more fully illustrate and describe my invention, reference is had tothe accompanying drawings and letters marked thereon, of which Figure 1is a side sectional elevation, and

Figure 2 is an end view.

Similar letters indicate like parts in each of the figures.

A represents an ordinary elliptic spring with my improvement attached,audconsists of two metal cups B B, fastened by plates at a to the centreof the inner faces of the upper and lower or main portions of thespring. The cups may be perforated with holes or openings, so as toallow the dust or water to pass through them. AnfI ndia-rubber orelastic ball, 0, is suspended midway between the two cups by means of avertical spindle or map, which is connected permanently, by a nut, andscrew, to the upper portion of the spring, while the lower portion ofthe rod works vertically in a hole made in the lower part of the spring,so that there is no hindrance to the free downward and upward movementof the spring; for this purpose, also, a hole should be made intheaxle-bed, so as to allow the rod free play when the spring is heavilyloaded. Other devices maybe employed to keep the elastic ball in place,so that when the spring is borne down it may be received between thecups, and the object may be very well accomplished by suspending theball in a horizontal manner by a rod and spiral coils attached to eachend of the minor axes or ends of the springs, so that the ball will bereceived by the cups, without deviating from a straight line as thespring is forced down. But I prefer the method as first described, asbeing the most certain and effective.

By the use of my springa much greater load can be carried without thedanger of breaking the leaves; and

where the springs are very light, with but little weight 'in thecarriage or wagon, they often break by the sudden tension and springwhich they are subject to, yet such is not the case where my device isused,,as the spring is prevented from being pressed down too far, andstill is kept strong and elastic by the rubber ball, and the supportfurnished by the metal cups and ball will'prevent the danger of beingthrown from the carriage to the ground should the spring bebroken ateither or both ends.

Having thus described my invention, I am well aware that blocks orpieces of India rubber have been and are used, placed between the upperand lower portions of the spring, but these are inetficient, and, inmany cases, useless, by'reason of the liability of their turning ordoubling from side to side; also the great distance which they areusually placed fromthe upper portion of the spring renders them oflittle utility, except when a wagon is loaded heavily'; and again, thecost of supplying these pieces of rubber for a wagon is much greaterthan the expense of providing and attaching my device. Consequently, Idoinot claim these blocks of rubber as my invention, but what I doclaim, and desire tmsecure by Letters Patent, isi The metal cups B B forreceiving the ball and supporting the spring, in combination with the.elastic ball 0, suspended or held in place by the rod D, between theupper and lower portion of the spring, substantially as described.

Iuwitness whereof I have hereunto set my hand and seal. 7 E. P..McOARTHY. n 8.]

Witnesses:

G. W. M. SMITH, J. L. Boone.

